On 27 Nov 2020, at 7:03 am, Ernest Christley echristley@att.net <flyrotary@lancaironline.net> wrote:

At 70 inches, you would want to go the other way.  The C4 gearset was 3.17, but the problem was the weak planetary gear carrier.  But, I just posted a link with a 6 planet carrier.

On Thursday, November 26, 2020, 5:56:14 PM EST, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:


On that note can I ask a gearbox question.
I’ve always understood we only really had the choice of 2.17 and 2.85 :1 gear ratio options if using the Ford planetary gears.

Looking at our Glasair and I imagine some other aircraft with prop diameters of around 70 inches we would prefer a ration around 2.6:1
giving us I think a better prop rpm and tip speed.

Are there other options?

Steve Izett



> On 27 Nov 2020, at 6:32 am, Ernest Christley echristley@att.net <flyrotary@lancaironline.net> wrote:
> > Is that the 4 planet, C4 gear set?  If so, I've been made to understand that there aluminum body gets wallowed out by the planet gear's shaft.  I recently found that there is a performance shop selling a replacement unit with six planets.  I know nothing about them other than that.
> > https://speedmaster79.com/Ford-C4-Transmission-Performance-6-Pinion-Planetary-Gear-Set
> > On Thursday, November 26, 2020, 3:16:01 PM EST, Le Roux Breytenbach breytenbachleroux@gmail.com <flyrotary@lancaironline.net> wrote:
> > > Terry : Thanks Terry for the Ross Redrive the parcel arrived on Monday 23 Nov .
> Neil if you want some dimensions on the hollow propellor shaft your welcome.
> Regards
> > > Sent from my iPhone
> Le Roux Breytenbach--
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